This article is from the Secure Sockets Layer Discussion List FAQ, by Shannon Appel SAppel@consensus.com with numerous contributions by others.
Navigator 3.0 and Communicator 4.x have an option to allow on-disk
caching of data fetched over SSL connections. The default setting is
to not cache https data on disk.
In Navigator 2.0, documents fetched using SSL were cached in the same
way as non-SSL documents. You could use the "Pragma: no-cache" HTTP
header to disable caching for a particular page.
In Navigator 1.0, documents fetched with SSL were not cached on disk.